Finding the Fourth Proportional to 101,020.52, 139,468.05 and 89,811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,020.52 : 139,468.05 = 89,811.50 : x
2. Step 2: Convert to fraction form
   101,020.52/139,468.05 = 89,811.50/x
3. Step 3: Cross multiply
   101,020.52x = 139,468.05 × 89,811.50
4. Step 4: Simplify right side
   101,020.52x = 12,525,834,772.58
5. Step 5: Solve for x
   x = 12,525,834,772.58/101,020.52
6. Step 6: Final answer
   x = 123,992.97